in the front 不是应该in the front of wall吗?

in the front wall
（门,或窗,或其他洞或开口）在前墙里
例子:There are two doors in the front wall and both lead to the bathroom.前墙上有两个去洗手间的门.
in the front of wall
在墙的前面（强调方位）
You should stand in the front of wall.
你应该站在墙前面.
in front of a (the) wall
在墙前面（强调墙）
You should stand in front of the wall.
你应该站在那个墙前面.
in front of 是方位介词,后面必须加参照物.
He always stands in front of me.他总站在我前面.
in front = in the front 是副词,指在..开始之前或..的前面.
He alway sits in the front when we have lectures in the big classroom.
在大教室上课的时候,他总坐在前面 （前面几排）.